Chain wrench



F. J. CARNELLI 1,824,944

CHAIN WRENCH Sept. 29, 1931'.

Filed 001:. 25, 1930 [W mg Francis J Carnalli ATTORNEY '30 after thepipe has been engaged and thehan- Patented Sept. 2 9, 1931 FRANCIS a.cannnnm;

or nEw Yon 11,33.

:03.511: w ca a iicaticn fli d team 25,

This invention relates to wrenches of'the chaintype in which the wrenchis provided with aw portions at the end ofthe: handle, and a link chainis passed around apipe engaged by these jawsfandthe chain secured to thebody'just back; of'the jaws, usually in an adjustable manner. It iscustomary to provide a pair of spaced plates or projections toconstitute these'jaw members," and further to provide teeth on theseportions, and

each jaw-plate is frequently made angular with the apex at the middle,in line with; the handle axis, from which angular portions of the jawsextend, diverging outwardly;

The object'of thepresent invention is to provide an improved form' ofjaws at the end, whereby the pipe can be placedat the middle portionthat is somewhat depressed, and then the chain made secure to the bodyafter passing around the pipe, and as the wrench handle is swung ineitherdirection, the side portionsof the jaw plates will-have aparticular cam action on the pipe, by tak ing up the small amount ofslack in the chain after it has been secured tothe bod In theaccompanying drawings s owlng embodiments of my invention,

Figure 1 is a side elevation of the wrench. Fig. 2is a similar view atthe end portiondle swung to clampingzposition.

Fig; 3 is a viewtaken at a right angleto that of Fig. 1. p 1 5 I Figs. 4and 5 show the jaw plates: detached. Fig. 6 shows the end of the handlebar. Fig. 7 is an end view partly insectionfi Fig. 8 is a cross sectionon the line '8'8 ofFig.1.

Fig. 9 1s a diagram takingthe relative v iqstitute the aws to engage thepipe. .In them) :form shown I providetoothed faces on each shape andposition er the jaw plate ends.

Fig. 10 showsanother form oflnut and: slotted portions of the plates] 7I K As shown in the drawings the wreneh com prises a body consistingotahandle 2 and jaw members or plates S-and 4,that are suitably secured tothe end of the'handleas by a bolt 5 passing through holes'6 andWintheplates and a-hole 8' in the handlerportion'. These plates haveslotted portions'at 9 and -10 .into

. axial line of the handle,'or nearer, and thus an angular. strain wouldbe exerted on this adwhich fits the squared end of the'handle to 1930;Serial No. 491,124;

prevent turningof the plates, and the bar is shownprovided with'lugs at11 and 12 that engage the rearedge of the plates respectively to receivethe end thrust of the plates on the bar, and thus relieve strain on thebolt 5.

; Any suitable meansmay be employed to'secure the linkchain 13 tothe'body, preferably to the Jplates, and which may be adjustable to"accommodate different sizes of pipes. As A shown each'plate; isprovided with a hook co projection 14,15, on its inner face extendingoutwardly and rearwardly, toreceive pins 16 on the chain 13, thatproject out beyond the links as indicated in Fig. 8. Theother end of pthe chain is shown adj ustably secured by means of a threaded bolt 17engaged'by a nut 18 that turns in slotted portions 19 and 20 in theplates 3 and 4, which nut will project outwardly through these slots forengagement by the-fingers of the user, and the bolt and chaincan travelendwise between the separated plates. .Where various sizes of pipes areengaged, the chain, after passing around the pipe','wi1l be broughtfurther out from the justing bolt, tending to twist it in the nut asthelatter remained with its axis parallel with the handle axis. Topermitthis nutto swing I provide it with a curved or spherical face 21;=s0

* and the edges orwalls ofthe plates 3 and 4 engaged by this curved nutface are curved or "spherical as" at 22 and 23.. Instead'of thespherical face of thenut and similar convex curves ofthe engaging'facesofthe plate slots s5 thenut 40 can have a flat face 41 in a plane,

a and the slot faces 42 and43 can becurved as a cylinder as shown inFig. 10.

The endwalls of the plates 3 and 4 con- 2 side of the middleiportionthat is depressed,

eachlying substantially inacurve, as at 24 and 25'in the jaw 3, and 26and 27in the jaw 4.- In Fig. 9,-I indicatea diagram show 96 ing thecurved arrangement of these jaw-faces i'24and 25. These curves as shownhave the vantage to form these curves with the center .tings.

of the curve 24 at 31, where the pin 16 is engaged by the hooks 14 and15; and the center of the curved face is located at the normal orapproximate position of the pivot connection of the bolt 17 with the endlink of the chain, .as at .32. It .will Joe zfiunther observed thatfleese pivot points are eqni-distant from the axis of the handle. Itwill be further observed that a common tangent line to the curves 24 and25 will have a'poin t-oftan Y gency at 36and 37, at the intersection ofthe lines 38 and 39 passing through the center 31 and 32 of the curves24;.and 25, and-parallel to the handle axis 30.

The jaws 3 and l arepnovigled eaehwvithan- (extension-44 and45$proj-eoting inwardly until they (contact ;as shown Fig. 7.. Thegend:f-aoes of these extensions gconrespond in contour {to the toothedcurved jaw portions .24 and 25 :Qif one jaw plateand 2.6 and of theother jaw plate. Thus it will ibe seen from Fig. if", :that !the jawsare practioal-ly'oontinu- .ous from side :to side atthe 'i-nner(or-middle POIlZi'OIlS, to better engage the smaller-sizes of pipes, :aswell ;as {to reinforce the jaws, and :better :engage .the flanges =orbeads ton gfit- In the use :of {the device a pipe-its is V placed at:the middle portion of the jaw plaites containing :the depnession .34,and the tree end of the chain passed around the pipe and brought ,dOVIItoengage the hooks 714. and 15. The nut 18 isadjusted one wayroirtheother so that one of :the pins :16 won {this end portion tOif thechain will pass .down into the. hook portions of the plates. 1 But this"will. provide a small amount :of slack in :the iohain as the link moves.into. this hook towards :the :jaws. As stated the nut .is turned :untilthe r can just pass 'down into the book after zbetween'the jaws at 31.Ellbis wi'lzl rloosen flzhe :wneneh onthe pipe :and lit :eanbe swungback going zaround the pipe the middle position, zasshoavn in Fig. 1.Then the handle .zis'-sw ung, :as -.to ithelett in Fig. 2., and the pipebeing stationary the "jaw face 23:11am er swing onlthe tace-of the pipe.It *will :be

seen from Fig. :2 that theshandle aw plates-' -zt0 :ohtaiin a (freshsgrip, .=and';then again iswlin'g ding the wrench to th'e'leit it willtumtlier turn the pipe, and thus have the. ratchet action.

It will be understood that if the wrench is swung to the right relativeto the pipe from the position of Fig. 1, the pipe will engage the jaw 25in the same manner and the'operation will be the same, with the ratchetaction to turn the pipe.

What I cm is .1. In a inhlin wrench, a body comprising a handle bar, apair of jaw plates secured at one end of the bar to form a pair of jawswithteeflhat the end of the wrench, and a link chain connected atpivotal points on opposite sides of the body, each toothed iawlend .faceon each side of the middle portion extending in the general form of afiat {convex lemme with the ahead-oi the curve on each :sideina-linement and transverse to the handle :a'xis.

2.: In a chain wneneh, a bodyrornprisi-ng a handle bar, :a of Eiawplates secured .at one rendzofzthehamtofonnagpainofjawsyprowit-led withteeth at the 16nd of the wrench, :and a aoon-amofied at pivotal pointson opposite 1816185 (of the body, each-jaw havingnmiiddle depressiomeaeh{toothedjawend .iliace gen .each side of the depression extendsing in\the general 'ifimtm :of a fiiXUGQDMeX curve '1 with the :chomd of flhe[curve on each side. 'lIl alinemcznt and transverse to handle axis. In achain wrench, a xC0 :P'fiSiI1g '18. handle bar, a pair of jaw .plaitessecured at (one and zoftlhe sbazr ito .zfienm a .pair of aws providedwith zteeth atmhemdiof the wrench, and a link :on opposite sides $01?the; body. at piwotml point-s substantially equi-distant from the axisof the handle, each 1}}1W hawizrrg {a middle depression, .eaeh atooithedjaw i'faoe aim each side of the depression ex tending the general :fonm0251a ifiat {convex nerve with the chord 10 the curve on each transverseto the hanandl- :a link chain rmrnected :adj nstably iat :ptvnatal pointon opposite sides not :the :body at, pornts substantially (equidistanttrom the axis oaf'thehandfle andwhich points are in a line.perpendicular -to the handle laEXiS, each ltojotheil jaw end ,rf-ace "oneach side of-the mididlejPflllfiOn :extendingin the genera-l form .of

a flat convex curve with the chord of the curve on each side inalinement and transverse to the handle axis.

6. In a chain wrench, a body comprising a handle bar, a pair of jawplates secured at one end of the bar to form a pair of jaws providedwith teeth at the end of the wrench, and a link chain connectedadjustably at pivotal points on opposite sides of the body at pointssubstantially equi-distant from the axis of the handle and which pointsare in a line perpendicular to the handle axis, each jaw having a middledepression, each toothed jaw and face on each side of the depressionextending in the general form of a flat convex curve with the chord ofthe curve on each side in alinement and transverse to the handle axis.

7 In a chain wrench, a body comprising a handle bar, a pair of jawplates secured at one end of the bar to form a pair of jaws providedwith teeth at the end of the wrench, and a link chain adjustablyconnected on opposite sides of the body at pivotal points substantiallyequi-distant from the axis of the handle, each toothed jaw and face oneach side of the middle portion extending in the side of the handleaxis, and which latter line on each side is parallel to the handle axis,

10. In aschain wrench, a body comprising a handle bar, a air of jawplates secured at a one end of the ar to form a air of jaws providedwith teeth at the end 0? the wrench, and a link chain adj ustablyconnected on opposite sides of the body atpivotal points ina lineperpendicular to the handle axis, and substantially equi-distant fromsuch axis, each jaw havin a middle depression, each toothed aw end aceon each side of the depression extending in a curve in which a tangentline common to the two curvesjof each jaw at the point of tangency ofeach curve will intersect a line passing through the; pivotal connectionof the chain on that side of the handle axis, and which latter line oneach side is parallel to the handle axis.

Signed at New York city, N. Y. on October 24, 1930. 1

FRANCIS GARNELLI.

general form of a flat convex curve in which a tangent line common tothe two curves of each jaw will intersect at the point of tangency ofeach curve, alinepassing through the pivotal connection of the chain onthat side of the handle axis and which latter line on each side isparallel to the handle axis. 7

8. In a chain wrench, a body comprising a handle bar, a pair of awplates secured at one end of the bar to form a pair of jaws providedwith teeth at the end of the wrench, and a link chain adjustablyconnected on opposite sides of the body at pivotal points substan tiallyequi-distant from the axis of the handle, each jaw having a middledepression, each toothed jaw end face on each side of the depressionextending in the general form of a flat convex curve in which atangent'line common to the two curves of each aw at the point oftangency of each curve will intersect a line passing through the pivotalconnection of the chain on that side of the handle axis and which latterline on each side is parallel to the handle axis. 7

9. In a chain wrench, a body comprising a I handle bar, apair of awplates secured at one end of the bar to form a pair of jaws providedwith teeth at the end of the wrench, and a link chain adj ustablyconnected on opposite sides of the body at pivotal points in a lineperpendicular to the handle axis, and substantially equi-distant fromsuch axis, each toothed jaw end face on each side of the middle portionextending in a curve in which a tangent line common to the two curves ofeach jaw at the point of tangency of eachcurve will intersect a linepassing through the pivotal connection of the chain on that

